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Cheap flights from Ontario to Washington from C$ 229

YYZ — SEA
16 Oct — 23 Oct1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ontario to Washington

Enter your travel dates to find the best prices.

Cheapest flights from Ontario to Washington

Tue 13/101:20 p.m. -
1 stop8h 25m
Tue 20/107:35 p.m. -
1 stop7h 00m
Deal found 15/9C$ 347
Wed 14/106:55 a.m. -
2 stops14h 50m
Thu 22/107:35 p.m. -
1 stop7h 00m
Deal found 12/9C$ 360
Fri 16/108:15 p.m. -
1 stop16h 25m
Fri 23/107:35 p.m. -
1 stop7h 00m
Deal found 14/9C$ 374
Sun 4/109:00 a.m. -
1 stop7h 50m
Sun 11/102:30 p.m. -
1 stop7h 35m
Deal found 15/9C$ 377
Sun 27/96:10 a.m. -
2 stops10h 40m
Mon 5/102:30 p.m. -
1 stop7h 35m
Deal found 13/9C$ 379
Sat 10/106:15 p.m. -
2 stops18h 25m
Sat 17/107:35 p.m. -
1 stop7h 00m
Deal found 12/9C$ 399
Thu 15/106:45 a.m. -
2 stops15h 00m
Thu 22/107:35 p.m. -
1 stop8h 30m
Deal found 13/9C$ 402
Thu 22/107:30 a.m. -
1 stop10h 16m
Wed 28/107:05 a.m. -
1 stop9h 30m
Deal found 15/9C$ 417
Sat 3/1012:00 p.m. -
1 stop28h 50m
Fri 9/102:30 p.m. -
2 stops11h 40m
Deal found 12/9C$ 421
Sun 27/96:45 a.m. -
2 stops15h 00m
Sat 3/107:35 p.m. -
1 stop8h 30m
Deal found 13/9C$ 423
Fri 16/1010:55 p.m. -
2 stops13h 45m
Thu 22/107:35 p.m. -
1 stop7h 10m
Deal found 12/9C$ 425
Thu 1/106:45 a.m. -
2 stops15h 00m
Sat 10/107:35 p.m. -
1 stop8h 30m
Deal found 14/9C$ 427

Find flight deals from Ontario to Washington

Round-trip from

C$ 347

One-way from

C$ 229

Popular in

June

Cheapest in

February

Average price

C$ 569

Good round-trip deal

C$ 687 or less

Good one-way deal

C$ 461 or less
WestJet
  • WestJet
  • 13/10-20/10
  • 2 total stops
  • 15h 25m total
  • Ontario to Washington
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WestJet
  • WestJet
  • 6/10-31/12
  • 2 total stops
  • 14h 50m total
  • Ontario to Washington
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (C$ 98 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 19 potential savings vs. average RT price).
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Average for round-trip flights in September 2026
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Price to beat on a round-trip flight from Ontario to Washington.
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Price to beat on a one-way flight from Ontario to Washington.
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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Ontario to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

TorontoPortland

YYZ Toronto Pearson Intl - PDX Portland

YYZPDX

Toronto Pearson Intl

Tue 3/11

12:10 p.m.-8:46 p.m.

2 stops11h 36m

Portland

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 258

MontrealPortland

YUL Montreal Pierre Elliott Trudeau Intl - PDX Portland

YULPDX

Montreal Pierre Elliott Trudeau Intl

Tue 6/10

7:30 a.m.-2:46 p.m.

1 stop10h 16m

Portland

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 258

MontrealSeattle

YUL Montreal Pierre Elliott Trudeau Intl - SEA Seattle/Tacoma Intl

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sun 27/9

6:45 a.m.-6:45 p.m.

2 stops15h 00m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 259

MontrealPortland

YUL Montreal Pierre Elliott Trudeau Intl - PDX Portland

YULPDX

Montreal Pierre Elliott Trudeau Intl

Fri 25/9

6:35 p.m.-12:34 a.m.

1 stop8h 59m

Portland

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 265

TorontoPortland

YYZ Toronto Pearson Intl - PDX Portland

YYZPDX

Toronto Pearson Intl

Sun 4/10

12:25 p.m.-8:16 p.m.

1 stop10h 51m

Portland

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 266

TorontoPortland

YYZ Toronto Pearson Intl - PDX Portland

YYZPDX

Toronto Pearson Intl

Fri 27/11

4:10 p.m.-11:09 p.m.

1 stop9h 59m

Portland

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 266

TorontoPortland

YYZ Toronto Pearson Intl - PDX Portland

YYZPDX

Toronto Pearson Intl

Fri 4/12

6:20 a.m.-12:48 p.m.

1 stop9h 28m

Portland

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 266

TorontoPortland

YYZ Toronto Pearson Intl - PDX Portland

YYZPDX

Toronto Pearson Intl

Tue 13/10

7:00 p.m.-9:50 a.m.

1 stop17h 50m

Portland

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 266

TorontoPortland

YYZ Toronto Pearson Intl - PDX Portland

YYZPDX

Toronto Pearson Intl

Sat 5/12

6:45 a.m.-6:31 p.m.

3 stops14h 46m

Portland

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 266

TorontoPortland

YYZ Toronto Pearson Intl - PDX Portland

YYZPDX

Toronto Pearson Intl

Tue 29/9

11:00 a.m.-10:57 p.m.

2 stops14h 57m

Portland

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 266

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/9

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Ontario to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from Ontario with our price prediction graph.
Estimated round-trip price

Cheapflights Insights

Everything you need to know about your flight from Ontario to Washington

What is the cheapest month to book a flight from Region of Ontario to State of Washington?

Currently, February is the cheapest month in which you can book a flight from Region of Ontario to State of Washington (average of C$ 356). Flying from Region of Ontario to State of Washington in June is currently the most expensive (average of C$ 647). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ON to WA?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Region of Ontario to State of Washington as you normally would.

Weekly flight availability from Region of Ontario to State of Washington

The most flights from CAON to USWA are scheduled on a Monday (4 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (1 on average).

How much does it cost to fly round-trip from Region of Ontario to State of Washington?

Airfare is below average for this route at the moment.
Region of Ontario to State of Washington flights typically cost between C$ 496 and C$ 777 in October.
The cheapest round-trip price found within the last 5 days was C$ 425 on WestJet (16 Oct-22 Oct).

How far ahead should I book a flight from Region of Ontario to State of Washington?

The price you pay for your flight from Region of Ontario to State of Washington may vary depending on when you book. For the best chance of a lower fare, look to book 85 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Reviews of airlines servicing Washington

Check out reviews from past customers who have flown with Alaska Airlines,Delta, andUnited Airlines from Ontario to Washington to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
12,937 reviews
Check prices

Boarding

8.1

Crew

8.5

Comfort

7.8

Food

7.0

Overall

7.9

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Alaska Airlines
7.9
Good
12,937 reviews
Alaska Airlines
7.9
Good
12,937 reviews
Check prices

Boarding

8.1

Crew

8.5

Comfort

7.8

Food

7.0

Overall

7.9

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Delta
7.8
Good
8,579 reviews
Alaska Airlines
7.9
Good
12,937 reviews
Check prices

Boarding

8.1

Crew

8.5

Comfort

7.8

Food

7.0

Overall

7.9

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
United Airlines
7.4
Good
10,214 reviews
Alaska Airlines
7.9
Good
12,937 reviews
Check prices

Boarding

8.1

Crew

8.5

Comfort

7.8

Food

7.0

Overall

7.9

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
WestJet
7.2
Good
3,446 reviews
Alaska Airlines
7.9
Good
12,937 reviews
Check prices

Boarding

8.1

Crew

8.5

Comfort

7.8

Food

7.0

Overall

7.9

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Air Canada
7.1
Good
11,640 reviews
Alaska Airlines
7.9
Good
12,937 reviews
Check prices

Boarding

8.1

Crew

8.5

Comfort

7.8

Food

7.0

Overall

7.9

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.

Related info for your journey

  • How long is the flight from Region of Ontario to State of Washington?

    For as low as C$ 462, WestJet can have you in State of Washington from Region of Ontario in 12h 58m. Region of Ontario and State of Washington are separated by a distance of 3663 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines to fly from Region of Ontario to State of Washington one-way?

    C$ 122 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Air Canada and Alaska Airlines, with prices starting from C$ 153 and C$ 171, respectively.

  • Can I find deals for flights from Ontario to Washington that include hotel bookings?

    Yes. In addition to deals on Ontario to Washington flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Washington?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Washington.

  • Can I find deals for business class flights from Ontario to Washington?

    Yes. Cheapflights offers flight deals from Ontario to Washington by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Region of Ontario to State of Washington?

    Currently, February is the cheapest month in which you can book a flight from Region of Ontario to State of Washington (average of C$ 356). Flying from Region of Ontario to State of Washington in June is currently the most expensive (average of C$ 647). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Ontario to Washington

Toronto Island to Newark flights
Pearson Intl to Newark flights
Pierre Elliott Trudeau Intl to Fort Lauderdale flights
Pearson Intl to LaGuardia flights
Toronto Island to LaGuardia flights
Pierre Elliott Trudeau Intl to LaGuardia flights
Vancouver Intl to Los Angeles flights
Pearson Intl to John F Kennedy Intl flights
Pearson Intl to Fort Lauderdale flights
Pierre Elliott Trudeau Intl to Miami flights
Pearson Intl to Las Vegas flights
Pierre Elliott Trudeau Intl to Newark flights
Toronto Island to John F Kennedy Intl flights
Pearson Intl to Orlando flights
Pierre Elliott Trudeau Intl to John F Kennedy Intl flights
Vancouver Intl to John F Kennedy Intl flights
Pearson Intl to Miami flights
Vancouver Intl to Newark flights
Pearson Intl to Dallas/Fort Worth flights
Pearson Intl to Los Angeles flights
Vancouver Intl to Las Vegas flights
Vancouver Intl to San Francisco flights
Hamilton to Newark flights
Pearson Intl to Hobby flights
Pierre Elliott Trudeau Intl to Los Angeles flights
Toronto Island to Fort Lauderdale flights
Pearson Intl to Dulles Intl flights
Vancouver Intl to Honolulu flights
Toronto Island to Orlando flights
Pearson Intl to San Francisco flights
Pearson Intl to Reagan-National flights
Pearson Intl to Seattle flights
Pierre Elliott Trudeau Intl to O'Hare Intl flights
Pierre Elliott Trudeau Intl to Orlando flights
Pearson Intl to George Bush Intcntl flights
Pierre Elliott Trudeau Intl to Dallas/Fort Worth flights
Pearson Intl to O'Hare Intl flights
Vancouver Intl to LaGuardia flights
Toronto Island to Boston flights
Vancouver Intl to Ontario flights
Pearson Intl to Sky Harbor Intl flights
Hamilton to Fort Lauderdale flights
Vancouver Intl to Seattle flights
Pearson Intl to Tampa flights
Pierre Elliott Trudeau Intl to Las Vegas flights
Vancouver Intl to San Diego flights
Pierre Elliott Trudeau Intl to Boston flights
Vancouver Intl to Palm Springs flights
Calgary to Las Vegas flights
Pearson Intl to Nashville flights

Top 5 airlines flying from Ontario to Washington

AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 226AverageC$ 721FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air CanadaCheapestC$ 252AverageC$ 633FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 254AverageC$ 664FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Alaska AirlinesCheapestC$ 269AverageC$ 654FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
WestJetCheapestC$ 276AverageC$ 531FlexibilityNo cancel feeOn-time60%
Search WestJet flights

Fly with Cheapflights

How does Cheapflights help users find flights from Ontario to Washington?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario to Washington. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Ontario to Washington?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Washington from Ontario.

Can Cheapflights find flights from Ontario to Washington with no change fees?

Need flexible booking options for your flight to Washington from Ontario? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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